Is this unprotected love or safe to say it's lust
Bustin', more than the sweat in somebody you trust

from Common (Ft. Lauryn Hill) – Retrospect for Life Lyrics on Rap Genius

Meaning

This word play refers to unsafe sex practice. Safe sex involves using protection from getting pregnant and STDs (when using a condom). Using a condom is often considered hard for a man because it takes time to put on and dulls stimulation.

Unprotected love refers to not using a condom, which would most likely cause a women to become pregnant. The resulting child could be said to be a physical manifestation of the couples love. How ever the idea of unprotected sex and impregnating a woman can be arousing for both the man/woman, as it doesn’t inhibit passion and mentally a man impregnating a woman signifies he’s willing to take care of her and their child(ren). Meaning they might just be trying to get pregnant for the excitement (lust) of it.

Busting (bustin') a nut (testicles) refers to a man ejaculating, which would increase one’s chances of impregnation. The human body often sweats during physical exertion like sex. A woman allowing a man to impregnate her is a sign of trust.

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